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A peer revieved international journal ONLINE ISSN 1943-2542 PRINTED ISSN: 1943-2429 http://ozelacademy.com/ojas.htm
Ozean Journal of Applied Sciences 4(4), 2011 Ozean Journal of Applied Sciences 4(4), 2011 ISSN 1943-2429 © 2009 Ozean Publication PREPARATION AND CHARACTERIZATION OF CHEMICAL BATH DEPOSITED NiSe THIN FILMS ANUAR KASSIM*, HO SOON MIN, TAN WEE TEE and YAZID ROSLI Department of Chemistry, Faculty of Science, University Putra, Malaysia *E-mail address for correspondence: anuar@science.upm.edu.my _________________________________________________________________________________________ Abstract: Nickel selenide thin films were deposited on microscope glass substrates using the chemical bath deposition method. The deposition was carried out using nickel sulphate as a Ni 2+ ion source and sodium selenite as a Se 2- ion source in the presence of Na 2 EDTA as a complexing agent. The structural and morphological properties of NiSe films obtained were investigated using X-ray diffraction and atomic force microscopy. X-ray diffraction patterns indicated that the films were polycrystalline NiSe with hexagonal structure. Based on the atomic force microscopy analysis, all the samples showed complete coverage of the substrate surface with the thickness of the films about 156-664 nm. When the bath temperature was increased from 55 to 75 °C, the grain size was increased but the band gap was decreased from 1.89 to 1.80 eV. Keywords: nickel selenide, chemical bath deposition, thin films, complexing agent __________________________________________________________________________________________ INTRODUCTION The thin films technology becomes more and more attractive for the researchers. The interest for chalcogenide semiconductor materials is based on their potential applications such as solar cells, sensor and laser materials. Thin films can be prepared by various methods such as spray pyrolysis (Badera et al., 2008), pulsed laser deposition (Shen et al., 2008), vacuum evaporation (Murali et al., 2004), electrodeposition method (Anuar et al., 2009), electron beam evaporation (Ahamed et al., 2010) and chemical bath deposition (Ezema et al., 2007). The preparation of thin films by the chemical bath deposition (Joshi et al., 2004; Chaudhari et al., 2008; Song et al., 2009; Anuar et al., 2011; Gopakumar et al., 2010; Raniero et al., 2010; Ubale 2010; Babu et al., 2011) is currently attracting a great deal of attention due to simple, no requirement of sophisticated instruments, minimum material wastage and easy coating of large surfaces. This method is based on the controlled release of the metal ions and chalcogenide ions in an aqueous bath into which the substrates are immersed. In this paper, we prepare NiSe thin films by chemical bath deposition method and study the effects of bath temperature on the properties of these materials. So far, we have not seen any literature review for the deposition of NiSe films in the presence of Na 2 EDTA as a complexing agent in acidic medium. 363
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